import { createApp } from 'vue'
import App from './App.vue'
import router from './router'
import store from './store'
//1.引入element-plus组件库与其样式
import ElementPlus, {ElMessage} from 'element-plus'
import 'element-plus/dist/index.css'
//2.引入element-plus图标库,并起别名为ElementPlusIconsVue
import * as ElementPlusIconsVue from '@element-plus/icons-vue'
//6.1修改elementPlus默认中文
import zhCn from 'element-plus/dist/locale/zh-cn.mjs'
import axios from "axios";

//10.1 配置后端服务器的根路径
const BASE_URL = 'http://localhost:';
//window对象是浏览器内置的全局对象,给它设置的属性就是全局属性,可以在任意的script标签中使用!
window.BASE_URL = BASE_URL;

const app = createApp(App)/* 创建vue实例,并起名为app */
//10.2 给app(Vue对象)也设置后端的根路径,这样可以在任意的template标签中使用!
app.config.globalProperties.BASE_URL = BASE_URL;

//3.将所有导入的图标组件变为键值对数组,并依次遍历取出每一个图标组件[key, component]
for (const [key, component] of Object.entries(ElementPlusIconsVue)) {
    // 4.将当前遍历到的图标组件注册为当前vue实例的全局组件
    app.component(key, component)
}
//5.为前vue实例应用element-plus组件库
//6.2 app.use(ElementPlus,{ locale: zhCn })将El本地化为中文
app.use(ElementPlus,{ locale: zhCn }).use(store).use(router).mount('#app')

//7.解决ResizeObserver Error
const debounce = (fn, delay) => {
    let timer = null;
    return function () {
        let context = this;
        let args = arguments;
        clearTimeout(timer);
        timer = setTimeout(function () {
            fn.apply(context, args);
        }, delay);
    }
}
const _ResizeObserver = window.ResizeObserver;
window.ResizeObserver = class ResizeObserver extends _ResizeObserver {
    constructor(callback) {
        callback = debounce(callback, 16);
        super(callback);
    }
}

//8.定义全局方法,获取当前登录的用户数据
window.getUser = () => {
    return localStorage.user ? JSON.parse(localStorage.user) : null ;
}

//9.配置路由守卫
//to 即将要去到的目标路由
//from 当前的路由
//next 是放行函数,调用next()才能进入到目标路由to
router.beforeEach((to, from, next) => {
    //获取当前登录的用户数据
    let user = localStorage.user;
    //登录了,就放行,没登录提示用户并跳转至登录页
    if(to.path!=='/login' && !user){//去的不是登录页 且 没登录
        next({path:'/login'},ElMessage.error('请先登录!'));
    }else{
        next();
    }
})

// //11.设置一个根据字典code查对应字典项的全局方法
// window.loadDictOption = (object,dictCode)=>{
//     //给后端发送请求
//     axios.get(BASE_URL+'/v1/dictoption/select/'+dictCode)
//         .then((response)=>{
//         if(response.data.code==2000){
//             object.value = response.data.data;
//         }else{
//             ElMessage.error(response.data.msg);
//         }
//     })
// }





